Antenna and lead-in device



AND LEAILIN D EVICE lled May 26 1953 ATTORNEY Patented Apr. 7, 1936 UNITED STATES PATENT OFFECE ANTENNA AND LEAD-IN DEVICE Hans Gnter Engel, Berlin-Pankow, Germany,

assigner to Telefunken Gesellschaft fr Drahtlose Telegraphie, m. b. H., Berlin, Germany, a corporation of Germany Application May 26, 1933, Serial No. 672,979 In Germany May 2S, 1932 4 Claims. (Cl. Z50-33) In modern broadcast receiver sets often aned to be joined with the antenna socket of the tenn of a few meters length are found sufcient receiver Set thrOugh the Cent-e1 COlillCtOl 2L, to insure reception from local as well as from While the other t leads from the oab'e metallic comparatively distant stations. As a result of shield 7c to the ground terminal of the set.

.5 the known distribution of stray fields in the in- Whether in addition a separate ,grounding of the terior of a building, indoor or room antennae are receiver is of advantage or whether the metallic not always serviceable. Now, the object of the Cable shield could simply be used as a counterinvention hereinafter to be disclosed provides poise is a point readily ascertainable by a practiways and means so that the necessary aerial is cal test. As shown a metal ierrule o on the end i disposed in a simple manner outside the` buildof lc is connected to pug t by a lead w. 10

ing, while the downlead brought to the receiver The support b is separately shown again in is accommodated inside a shielded iiexible cable. Figs. 3 and 4 which illustrate the case where the While this idea has been basicaily known in the antenna rod proper, which may be of a length prior art, its application mostly proved imposranging between 2 and 3 meters, is adapted to be sible because of high cost of material and mountremoved from the holding or supporting means.

ing as well as the lack of experts whose opinion Figs. 3 and 4 show that the antenna rod not could insure success with a shielded antenna arbe. mounted absolutely vertically, but may be porangement only after an inspection of the lositioned also-at an angle of inclination with refcality and surrounding conditions. erence to the support member.

2:) A further object of the invention is to provide Fig. 4 shows a sectional view of a support or 20 a simple and inexpensive antenna holder or supaerial holder means. c denotes a metallic bush port which may easily be attached to any deor sleeve in which is iixedly arranged an insulasired part of a building, such as a window casetion tube f. Fitted in the latter is a metal piece .7 ment. in the cavity of which is tted the aerial d. By

5:5 A still further object is to provide a simple artightening the two screws h the antenna d can be 25 rangement whereby the lead in to the receiver is rmly and conductively connected with the metal completely shielded between it and the antenna. sleeve g. Connected with the latter is the inter- Other objects of the invention will be apparent nal conductor u of the shielded cable c. The to those skilled in the art as the description metal sheath lc of the cable is united at the same zo thereof proceeds. The preferred embodiment of time with the sleeve e as shown at 4. 3o the invention is disclosed in the attached draw- It will then be seen that sleeve e and antenna ing in which: holder g form supporting means for the end of Fig. l shows the general arrangement of the cable c. As shown cylindrical sleeve e has an antenna and the lead in to the receiver; integral bracket or substantially at end plate 5 Fig. 2 shows the terminal connections for the formed therewith, one surface of which may be 35 receiver at the end of the lead in; and, in contact with window frame r, and supported Figs. 3 and 4 show a front view and partial thereby by screws, bolts or other well known sectional view respectively of the antenna supfastening means, not shown. As shown, antenna port and inner end of the antenna. a and members e, f and g have circular outlines lo The new kind of antenna as here disclosed is or sections but other cross sectional shapes may 40 fundamentally illustrated in Fig. 1, where a debe used for these members, if desired. notes the antenna properly so-called which has The advantage of this antenna type is that the form either of a metallic rod or of an insulathe same may be mounted by inexperienced men. tion tube provided with an internal or external It may furthermore be disposed on a window ,3 metallic conductor. The same is supported by a or at some other place where interference need supporting means b which may be readily atto be feared not at all or only to a limited extent. tached to the Window frame r of wood or other The most favorable place is readily determinable insulation material. The construction may be empirically. In the case of network-supplied chosen so that the aerial is firmly connected with (all-electric) sets it is advisable to provide in ,50 the support or is shiftable thereon or removable addition some good arrester as found on the 5o therefrom. From the support b the screened market. Cable C flXedly attached theretO iS run dOWIl t0 Where receiver sets are involved that are relahe eCeVel' Eapparatus d. The end thereof, as tively insensitive whenever the antenna a is Shown in Fig. 2, iS fitted With WO banane type not long enough, an additional antenna wire i plug connectors, one of these plugs s being adaptcan be easily attached to the end of antenna a as shown diagrammatically in Fig. 1, the said wire extension being either allowed to hang down or being brought to a supporting point in the neighborhood.

What may also be mentioned is that occasionally cases may arise Where interference actions upon the antenna may arise at little distance outside the house. In a case like that a remedy and cure can be found in providing a supplementary shielding piece extending, as it were, the sheath e of the supporter b.

While for purposes of description, a specific embodiment of my invention has been shown, it will be understood that it is not limited to the form herein disclosed but is intended to include all structures coming within the scope of the following claims.

I claim as my invention:

1. In a device of the class described, the combination of a bracket having a substantially fiat end portion adapted to be secured to a window frame, and an extending hollow sleeve portion, an insulating sleeve in engagement with the interior surface of said extending portion, a metallic rod having an elongated hole therein supported within said insulating sleeve, said rod having a solid portion between the lower end of said hole and the outer surface of said bracket, an antenna consisting of a rigid metal rod having an end portion extending Within said elongated hole into Contact with the solid portion of said rod and means engaging said insulating sleeve, said metallic rod and said antenna for retaining said antenna in a iixed position in said metallic rod.

2. In a device of the class described, a bracket formed of metal and having a hollow extending portion, an insulation sleeve mounted within said extending portion, a metallic rod mounted within said sleeve and arranged to support an antenna, an antenna consisting of a thick rigid metal rod in engagement with said rod, a transmission cable having a center conductor connected to said metallic rod, and a metallic shield enclosing said conductor having one end terminating in and in conductive connection with said bracket whereby the connection between the center conductor and the end of said antenna is shielded.

3. In a device of the class described, the combination of a metallic bracket having a ilat end wall adapted to be clamped to a vertical wall and a hollow cylindrical sleeve extending upwardly at an acute angle to said end wall, said sleeve being provided with an aperture, a hollow insulation sleeve mounted within said cylindrical sleeve, a metallic rod mounted within said insulation sleeve, said rod having a solid end portion at one end and a cylindrical bore extending from its other end to said solid portion, a rigid, metallic rod constituting an antenna having one end seated in said cylindrical bore, the end of said antenna engaging the solid portion of said rod, and securing means passing through the aperture in said cylindrical sleeve and engaging said antenna to secure it in position.

4. In combination, a bracket having a ilat portion adapted to engage a vertical wall and a hollow portion extending upward at an acute angle to said wall, a sleeve formed of insulation material secured within the hollow portion of said bracket, an antenna comprising a rigid metallic rod having its inner end mounted within and secured to said sleeve and a flexible wire extension secured to and depending from the outer end of said rod.

HANS GNTER ENGEL. 

